Abstract: A control part outputs a signal demanding an engine start when it is determined that a temperature of cooling water detected by a water temperature detector is lower than a threshold. In a normal state where conditioned-air is blown off to a predetermined seat and the other seats, the control part lowers the threshold according to an increase in a heat amount emitted from an auxiliary heating element based on the operating state of the auxiliary heating element. When a predetermined seat air conditioning command is provided to air-condition the predetermined seat, as a control of a predetermined seat state, the control part controls an opening-and-closing part to close an air outlet and further lowers the threshold rather than the threshold controlled in the normal state.